### Applying Transparency with CSS Opacity

Source: https://webfiles-sc1.blackbaud.com/files/support/helpfiles/education/k12/full-help/content/sws-styles_Highlight=Back+to+School

Demonstrates how to make a background transparent using CSS opacity. This method affects the element and all its children. It's typically used on container elements.

```css
/* Option 1: Affects element and children */
.container {
  opacity: 0.5; /* Value between 0 and 1 */
}
```